I assume that purchases made at Disney springs cannot be made using magic bands (or charging to the room), is that correct? Also, can items be delivered to rooms if purchased at 'non disney' retail shops at Disney Springs?
You can use Magic Bands at practically every shop in Disney Springs. There may be a few exceptions, but Disney expects them to get it together. I used my at Lily Putlizer and saw them being used at several other stores.
Great news! Saves me from having to bring different payment options. So easy to just scan your magic band....too easy! Lol I'll be happily shopping my first day there!